Rick: Having owned the Classic 150s for a number of years, and having heard the VT 100/200s at dealers om a number of occasions, I'd have to say that the VT amps are, slightly, the more tube-like amps, in my view. The Classic 150s are great amps, no mistake, but they have a solid state input section that, while giving it terrific bass definition and control for a tubed amp, also gives just a little bit of a transistory edge to them, and while the triode mode is quite magical with vocals, it still sounded a little "bleached" (i.e., harmonically thin) to me, particularly compared to the Jadis JA 80s I replaced them with (the opposite end of the tubed spectrum, in some ways). Now that "bleached" sound I refer to is what others refer to as "high-definition", and it is an ARC house sound that has carried through to today, but the VT 100 uses a tubed input stage, I recall, and has just a little more of a tubed signature to my ears (while still high-definition, it seems a little better in terms of a fuller, richer harmonic presentation than the CL 150). I'm not sure about the VT200's input stage, but if it does use a solid state input stage it is using a nicer sounding one to me, as it too sounds more tube-like to me than my recollection of the Classic 150s. Mind you, the differences are really quite minor and I don't think you could go wrong with any of these amps, even keeping your own, but if you're going for a more classic tube presentation among ARC amps, I think the VT series would more match that description. My two cents, for what it's worth.
